frp/server/service.go

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// Copyright 2017 fatedier, fatedier@gmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
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package server
import (
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"bytes"
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"fmt"
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"io/ioutil"
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"net"
"net/http"
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"time"
"github.com/fatedier/frp/assets"
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"github.com/fatedier/frp/g"
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"github.com/fatedier/frp/models/msg"
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"github.com/fatedier/frp/server/group"
"github.com/fatedier/frp/server/ports"
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"github.com/fatedier/frp/utils/log"
frpNet "github.com/fatedier/frp/utils/net"
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"github.com/fatedier/frp/utils/util"
"github.com/fatedier/frp/utils/version"
"github.com/fatedier/frp/utils/vhost"
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"github.com/fatedier/golib/net/mux"
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fmux "github.com/hashicorp/yamux"
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)
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const (
connReadTimeout time.Duration = 10 * time.Second
)
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var ServerService *Service
// Server service
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type Service struct {
// Dispatch connections to different handlers listen on same port
muxer *mux.Mux
// Accept connections from client
listener frpNet.Listener
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// Accept connections using kcp
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kcpListener frpNet.Listener
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// Accept connections using websocket
websocketListener frpNet.Listener
// For https proxies, route requests to different clients by hostname and other infomation
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VhostHttpsMuxer *vhost.HttpsMuxer
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httpReverseProxy *vhost.HttpReverseProxy
// Manage all controllers
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ctlManager *ControlManager
// Manage all proxies
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pxyManager *ProxyManager
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// Manage all visitor listeners
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visitorManager *VisitorManager
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// Manage all tcp ports
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tcpPortManager *ports.PortManager
// Manage all udp ports
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udpPortManager *ports.PortManager
// Tcp Group Controller
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tcpGroupCtl *group.TcpGroupCtl
// Controller for nat hole connections
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natHoleController *NatHoleController
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}
func NewService() (svr *Service, err error) {
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cfg := &g.GlbServerCfg.ServerCommonConf
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svr = &Service{
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ctlManager: NewControlManager(),
pxyManager: NewProxyManager(),
visitorManager: NewVisitorManager(),
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tcpPortManager: ports.NewPortManager("tcp", cfg.ProxyBindAddr, cfg.AllowPorts),
udpPortManager: ports.NewPortManager("udp", cfg.ProxyBindAddr, cfg.AllowPorts),
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}
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svr.tcpGroupCtl = group.NewTcpGroupCtl(svr.tcpPortManager)
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// Init assets.
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err = assets.Load(cfg.AssetsDir)
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if err != nil {
err = fmt.Errorf("Load assets error: %v", err)
return
}
var (
httpMuxOn bool
httpsMuxOn bool
)
if cfg.BindAddr == cfg.ProxyBindAddr {
if cfg.BindPort == cfg.VhostHttpPort {
httpMuxOn = true
}
if cfg.BindPort == cfg.VhostHttpsPort {
httpsMuxOn = true
}
}
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// Listen for accepting connections from client.
ln, err := net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.BindAddr, cfg.BindPort))
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if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
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svr.muxer = mux.NewMux(ln)
go svr.muxer.Serve()
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ln = svr.muxer.DefaultListener()
svr.listener = frpNet.WrapLogListener(ln)
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log.Info("frps tcp listen on %s:%d", cfg.BindAddr, cfg.BindPort)
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// Listen for accepting connections from client using kcp protocol.
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if cfg.KcpBindPort > 0 {
svr.kcpListener, err = frpNet.ListenKcp(cfg.BindAddr, cfg.KcpBindPort)
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if err != nil {
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err = fmt.Errorf("Listen on kcp address udp [%s:%d] error: %v", cfg.BindAddr, cfg.KcpBindPort, err)
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return
}
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log.Info("frps kcp listen on udp %s:%d", cfg.BindAddr, cfg.KcpBindPort)
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}
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// Listen for accepting connections from client using websocket protocol.
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websocketPrefix := []byte("GET " + frpNet.FrpWebsocketPath)
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websocketLn := svr.muxer.Listen(0, uint32(len(websocketPrefix)), func(data []byte) bool {
return bytes.Equal(data, websocketPrefix)
})
svr.websocketListener = frpNet.NewWebsocketListener(websocketLn)
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// Create http vhost muxer.
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if cfg.VhostHttpPort > 0 {
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rp := vhost.NewHttpReverseProxy(vhost.HttpReverseProxyOptions{
ResponseHeaderTimeoutS: cfg.VhostHttpTimeout,
})
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svr.httpReverseProxy = rp
address := fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.VhostHttpPort)
server := &http.Server{
Addr: address,
Handler: rp,
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}
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var l net.Listener
if httpMuxOn {
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l = svr.muxer.ListenHttp(1)
} else {
l, err = net.Listen("tcp", address)
if err != nil {
err = fmt.Errorf("Create vhost http listener error, %v", err)
return
}
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}
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go server.Serve(l)
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log.Info("http service listen on %s:%d", cfg.ProxyBindAddr, cfg.VhostHttpPort)
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}
// Create https vhost muxer.
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if cfg.VhostHttpsPort > 0 {
var l net.Listener
if httpsMuxOn {
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l = svr.muxer.ListenHttps(1)
} else {
l, err = net.Listen("tcp", fmt.Sprintf("%s:%d", cfg.ProxyBindAddr, cfg.VhostHttpsPort))
if err != nil {
err = fmt.Errorf("Create server listener error, %v", err)
return
}
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}
svr.VhostHttpsMuxer, err = vhost.NewHttpsMuxer(frpNet.WrapLogListener(l), 30*time.Second)
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if err != nil {
err = fmt.Errorf("Create vhost httpsMuxer error, %v", err)
return
}
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log.Info("https service listen on %s:%d", cfg.ProxyBindAddr, cfg.VhostHttpsPort)
}
// Create nat hole controller.
if cfg.BindUdpPort > 0 {
var nc *NatHoleController
addr := fmt.Sprintf("%s:%d", cfg.BindAddr, cfg.BindUdpPort)
nc, err = NewNatHoleController(addr)
if err != nil {
err = fmt.Errorf("Create nat hole controller error, %v", err)
return
}
svr.natHoleController = nc
log.Info("nat hole udp service listen on %s:%d", cfg.BindAddr, cfg.BindUdpPort)
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}
// Create dashboard web server.
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if cfg.DashboardPort > 0 {
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err = RunDashboardServer(cfg.DashboardAddr, cfg.DashboardPort)
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if err != nil {
err = fmt.Errorf("Create dashboard web server error, %v", err)
return
}
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log.Info("Dashboard listen on %s:%d", cfg.DashboardAddr, cfg.DashboardPort)
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}
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return
}
func (svr *Service) Run() {
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if svr.natHoleController != nil {
go svr.natHoleController.Run()
}
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if g.GlbServerCfg.KcpBindPort > 0 {
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go svr.HandleListener(svr.kcpListener)
}
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go svr.HandleListener(svr.websocketListener)
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svr.HandleListener(svr.listener)
}
func (svr *Service) HandleListener(l frpNet.Listener) {
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// Listen for incoming connections from client.
for {
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c, err := l.Accept()
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if err != nil {
log.Warn("Listener for incoming connections from client closed")
return
}
// Start a new goroutine for dealing connections.
go func(frpConn frpNet.Conn) {
dealFn := func(conn frpNet.Conn) {
var rawMsg msg.Message
conn.SetReadDeadline(time.Now().Add(connReadTimeout))
if rawMsg, err = msg.ReadMsg(conn); err != nil {
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log.Trace("Failed to read message: %v", err)
conn.Close()
return
}
conn.SetReadDeadline(time.Time{})
switch m := rawMsg.(type) {
case *msg.Login:
err = svr.RegisterControl(conn, m)
// If login failed, send error message there.
// Otherwise send success message in control's work goroutine.
if err != nil {
conn.Warn("%v", err)
msg.WriteMsg(conn, &msg.LoginResp{
Version: version.Full(),
Error: err.Error(),
})
conn.Close()
}
case *msg.NewWorkConn:
svr.RegisterWorkConn(conn, m)
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case *msg.NewVisitorConn:
if err = svr.RegisterVisitorConn(conn, m); err != nil {
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conn.Warn("%v", err)
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msg.WriteMsg(conn, &msg.NewVisitorConnResp{
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ProxyName: m.ProxyName,
Error: err.Error(),
})
conn.Close()
} else {
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msg.WriteMsg(conn, &msg.NewVisitorConnResp{
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ProxyName: m.ProxyName,
Error: "",
})
}
default:
log.Warn("Error message type for the new connection [%s]", conn.RemoteAddr().String())
conn.Close()
}
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}
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if g.GlbServerCfg.TcpMux {
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fmuxCfg := fmux.DefaultConfig()
fmuxCfg.LogOutput = ioutil.Discard
session, err := fmux.Server(frpConn, fmuxCfg)
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if err != nil {
log.Warn("Failed to create mux connection: %v", err)
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frpConn.Close()
return
}
for {
stream, err := session.AcceptStream()
if err != nil {
log.Debug("Accept new mux stream error: %v", err)
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session.Close()
return
}
wrapConn := frpNet.WrapConn(stream)
go dealFn(wrapConn)
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}
} else {
dealFn(frpConn)
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}
}(c)
}
}
func (svr *Service) RegisterControl(ctlConn frpNet.Conn, loginMsg *msg.Login) (err error) {
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ctlConn.Info("client login info: ip [%s] version [%s] hostname [%s] os [%s] arch [%s]",
ctlConn.RemoteAddr().String(), loginMsg.Version, loginMsg.Hostname, loginMsg.Os, loginMsg.Arch)
// Check client version.
if ok, msg := version.Compat(loginMsg.Version); !ok {
err = fmt.Errorf("%s", msg)
return
}
// Check auth.
nowTime := time.Now().Unix()
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if g.GlbServerCfg.AuthTimeout != 0 && nowTime-loginMsg.Timestamp > g.GlbServerCfg.AuthTimeout {
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err = fmt.Errorf("authorization timeout")
return
}
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if util.GetAuthKey(g.GlbServerCfg.Token, loginMsg.Timestamp) != loginMsg.PrivilegeKey {
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err = fmt.Errorf("authorization failed")
return
}
// If client's RunId is empty, it's a new client, we just create a new controller.
// Otherwise, we check if there is one controller has the same run id. If so, we release previous controller and start new one.
if loginMsg.RunId == "" {
loginMsg.RunId, err = util.RandId()
if err != nil {
return
}
}
ctl := NewControl(svr, ctlConn, loginMsg)
if oldCtl := svr.ctlManager.Add(loginMsg.RunId, ctl); oldCtl != nil {
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oldCtl.allShutdown.WaitDone()
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}
ctlConn.AddLogPrefix(loginMsg.RunId)
ctl.Start()
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// for statistics
StatsNewClient()
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return
}
// RegisterWorkConn register a new work connection to control and proxies need it.
func (svr *Service) RegisterWorkConn(workConn frpNet.Conn, newMsg *msg.NewWorkConn) {
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ctl, exist := svr.ctlManager.GetById(newMsg.RunId)
if !exist {
workConn.Warn("No client control found for run id [%s]", newMsg.RunId)
return
}
ctl.RegisterWorkConn(workConn)
return
}
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func (svr *Service) RegisterVisitorConn(visitorConn frpNet.Conn, newMsg *msg.NewVisitorConn) error {
return svr.visitorManager.NewConn(newMsg.ProxyName, visitorConn, newMsg.Timestamp, newMsg.SignKey,
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newMsg.UseEncryption, newMsg.UseCompression)
}
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func (svr *Service) RegisterProxy(name string, pxy Proxy) error {
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return svr.pxyManager.Add(name, pxy)
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}
func (svr *Service) DelProxy(name string) {
svr.pxyManager.Del(name)
}